Endevco® model 751 low-cost Isotron® accelerometer

Product catalog summary

Overview: The Endevco® model 751 is a cost-effective, lightweight piezoelectric accelerometer with integral electronics, designed for vibration measurement on small structures. It is hermetically sealed to prevent environmental contamination and offers high output sensitivity, a high signal-to-noise ratio, and wide bandwidth.

Features: The accelerometer uses Endevco’s Piezite® Type P-8 crystal element in annular shear mode, providing low base strain sensitivity and stable output over time. It includes an internal hybrid signal conditioner in a two-wire system, transmitting low impedance voltage output through the same cable that supplies constant current power. The unit can be electrically isolated from ground using an isolated mounting stud.

Specifications: The model 751 is available in two versions, 751-10 and 751-100, with output sensitivities of 10 mV/g and 100 mV/g, respectively. It has a frequency response of 0.3 to 15K Hz and a resonance frequency of 50 kHz. The accelerometer is designed to operate within a temperature range of -67°F to +257°F and can withstand sinusoidal vibration and shock limits of 500 g pk and 5000 g pk, respectively.

Output and Power: The accelerometer produces a positive output when acceleration is directed into the base. It requires a compliance voltage of +18 to +24 Vdc and a supply current of +2 to +20 mA. The DC output bias voltage ranges from +8.5 to +11.5 Vdc.

Environmental and Physical Characteristics: The unit is hermetically sealed and made from titanium alloy, weighing 7.8 grams. It uses a 10-32 Microdot side connector and requires a mounting torque of 18 lbf-in.

Calibration and Accessories: Calibration data traceable to NIST is provided. Accessories include mounting studs, cable assemblies, and signal conditioners. Endevco offers factory calibration services to maintain precision and accuracy.

Recommendations: Endevco recommends using signal conditioner models 133, 2793, 2775B, or 4416B with these accelerometers. The company reserves the right to modify specifications without notice and emphasizes reliability through stringent quality control measures.

Catalog excerpts

Endevco® model 751 low-cost Isotron® accelerometer-1

Endevco Model 751 isotron(fl) accelerometer Features Description NtWI 75M0-Rand/bl-lOO-Ravailable as replacement sensors High Irequency measurement Wide bandwidth Lighl weight Outstanding signal-to-noise Hermetically sealed The Endevco* model 751 is a low-cost, Iightweight piezoetectnc accelerometer with intgral electromcs. designed specifically for measurng vibration on smalt structures This uml is hermetically sealed againsl environmental contamination The 751 lealures a high output sensitivity, high stgnal-to-noise ratio, and a wide bandwidth. Model 751 is the best value inaccelerometers on the market today The model 751 features Endevco s Piezite#Type P-8 cryslal 鯩lment, operating in annular shear mode, which exhibits low base strain sensitivity and excellent output stability over time. This accelerometer incorportes an internai hybnd signal conditioner in a two-wire System, whtch transmits its low imp颩dance voltage output through the same cable that supplies the constant current power Signal ground is connected to the outer case of the unit When used with an isolated mounling stud, it can be etectrically isolated from ground A model numbersufHx indicates acclration sensttivily in mV/gf i.e., 751-100 teatures output sensitivity of 100 mV/g Endtvro aigrit conditioner moefets 133. 7793. 77759. or U168 orc rveommenoed tor WTESWTrltWEVCO WIT>1 1032UNF fREQU驣NCY*4MERTZ TYPKAL TIMFIRATUPL RLSPOTSL UN» D32 jm ;*] -il! NJ x 13 p3) hffp M 1*9 1 STANDARD TOimUtfJ tfOS iMt I WFTFRS) XX-^03 (X-*J B\ MEGGiTT Smartengineeringforextr*meenvironments

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Endevco® model 751 low-cost Isotron® accelerometer-2

Model 751 Endevco Isotron-' accelerometer Spcifications The fotlowmg performance spcifications conform lo ISA-RP-37 2 |196t) and are typical values, referenced al -7$°驯 |*24°C], k mA and ICO M;, unie» oiherwae noted Callbration data, rracsablo lo National Insinute of Standards and Technology jNIST). « suppltad Dynamic eharacteristics Range Voilage sensjtlvity Tolrance Frequency response Rsonance f requency Amplitude response 11 dB Transverse sensitrvity femperature response Amplitude nonlinrarity. to F.S. Units 0 mV/驻 Typ -10 *500 10 +10% See typtcal amplitude 50 03to 5K s5 See typical curve...

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